A San Francisco city ordinance could make the Giants the first team in Major League Baseball to ban chewing tobacco on the field.

City supervisors voted unanimously on Tuesday to ban smokeless tobacco in playing fields throughout the city and specifically targeted baseball—a sport infamous for the player’s use of tobacco, according to a statement from the Campaign for Tobacco-Free Kids, which pushed for the law.

The ordinance must pass one more vote and, if San Francisco Mayor Ed Lee signs, the rule will be implemented on Jan. 1 2016—in time for the MLB baseball season.

Jess Montejano, a legislative aide for the ban’s chief sponsor, Supervisor Mark Farrell, told TIME that legislators began working on the ordinance in the beginning part of 2015 because “it’s a serious health issue” in which “kids are seeing their athletic heroes chewing tobacco on the baseball diamond.”

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Montejano also added the San Francisco Giants “are fully aware of the intention” and that proponents of the ban believed the team would support MLB’s stance on the issue of chewing tobacco.

After the law was initially proposed in late Feb., MLB issued a statement saying that it “has long supported a ban of smokeless tobacco at the Major League level” and that it had been seeking “a ban of its use on-field in discussions with the Major League Baseball Players Association.”

A study published April 10 from the University of California San Francisco suggested that seeing players chewing tobacco was akin to product endorsement. It found that “modeling of smokeless tobacco use by…elite athletes is strongly associated with smokeless tobacco initiation among adolescent males.” The study also cited an NCAA statistic that found that 52.3% of collegiate baseball players tried smokeless tobacco at least once in 2012 to 2013.

When asked if the ban would essentially force players to quit, Montejano cited former MLB pitcher Curt Schilling, who blames tobacco for his mouth cancer. “Schilling said it was the worst thing about his life and if he could change one thing from his younger years it would be to quit.”